When we saw plant cells placed in high concentrations of salt, what did you observe about the responses of the cell wall and the cell membrane? how were they similar and how were they different? be specific. what might that tell you about the structure of the cell wall versus the cell membrane? explain. not all molecules that a cell needs are going to be able to enter a cell by diffusion through the cell membrane. give two examples of molecules that a cell might need and explain why they can’t enter by diffusion.